They're worth it if you like well-crafted figurines and/or if you have a game where they provide significant functionality that can't be obtained otherwise (e.g., Smash Bros) as opposed to providing something that's just cosmetic or could be gotten by other means (e.g., Mario Maker).

ANYWAY........ I have so far managed to resist the temptation to buy amiibo, other than Ness and Lucas which were necessary because of my recent playthroughs of Earthbound and Mother 3 and subsequent obsession with the series.